Номер 4 и 5......помагите

We are not sitting in the park.
David is not ...
I am not working 
The dogs are not eating
Sarah is not having 
5) Are you doing a test? 
Is your teacher sleeping?
Is it raining today?
Используйте вспомогательные глаголы am is are в зависимости от того, кто выполняет действие , а к концу слова прибавляйте ing 
принцип выполнения очень прост.

1.Are you doing a test? Yes,I'm.
2.Are your teacher sleeping?No,He is not.
3.Are your friends studying? Yes, they are.
4.Is it raining today?No, it isn't.
5.Are your classmates singing? No,they aren't.
6.Is your dad working?Yes, he is.